Handheld apparatus for delivery of particulate matter with directional flow control

ABSTRACT

A disposable apparatus for propelling particulate matter against a surface of a target material that includes: a mixing chamber having a chamber wall, a multi-conduit receiving port, a propellant-gas receiving conduit, and a discharge conduit. The gas delivery conduit extends from the propellant-gas receiving port into the chamber, a mixture discharge conduit extending from the mixture discharge port into the chamber, and a quantity of particulate matter inside the chamber. The disposable apparatus further includes a membrane capable of allowing a gas stream to pass through when the gas stream is flowing and seals the mixing chamber when the gas stream is not flowing. The membrane can be of a hemispherical shaped, molded piece that includes at least one slit to provide an opening when the gas stream is flowing. A method is provided for propelling particulate matter against a surface of a target material using the above-described apparatus, including the steps of delivering a stream of gas into the air delivery conduit and into the mixing chamber from the gas source, so that the gas stream blows through the quantity of particulate matter, causing the particulate matter to mix with the gas stream, forming a gas and particle mixture, and discharging the mixture through the discharge conduit and the discharge port to strike the surface of the target material. The method further provides a means for automatically containing the particulate matter within the mixing chamber when the apparatus is not in use.

RELATED U.S. APPLICATION DATA

Continuation in Part and claiming priority to application Ser. No.08/517,379 filed Aug. 21, 1995 and Ser. No. 09/196,498, filed Nov. 21,1998, which are included by reference herein.

FIELD OF THE INVENTION

This invention relates to a device and to a method. More specifically,this invention is directed to a self-contained device for directing afluid stream containing particulate matter against a surface to abrade,etch, erase, cut, penetrate, smooth, clean, polish and harden thesurface. In one of the preferred embodiments of the invention theparticulate matter is contained within the device, and a carrier fluid,under pressure, introduced therein to produce a fluid stream that can bedelivered to a target surface. The device can be powered and/orenergized by a source of compressed gas that is coupled to the devicethrough a fixture designed for that purpose. The invention also includesa method for delivery of a particle stream, under pressure, to a targetsurface; and, to the selective modification of the target surfacedepending upon the hardness of the particle, the velocity of impact andthe extent of the exposure of the target surface to the particle stream.

DESCRIPTION OF THE PRIOR ART

The use of abrasives to modify the surface of an object (e.g., clean,polish, etch, etc.) is common practice in a variety of environments andprofessions. Typically such abrasive can take the form of a paste orfree-flowing powder, and delivered to the surface of an object eithermanually, or through the use of a mechanical implement, or suspended influid (gas or liquid).

In the dental profession abrasives can be used to clean teeth and in thepreparation of the dentition for bonding with various enamels and/orhardening agents. Typically the abrasive is delivered to the surface ofthe teeth by means of a carrier fluid stream (e.g., air or inert gas)containing a particulate abrasive. The object of such treatment is toremove foreign material, roughen or etch the surface to enhance bondingquality, or to dull an unsightly shine. As the gas and particulatematter impact the target material under pressure, the abrasive nature ofthe particles progressively causes layers of the target material tosheer one at a time. This process of controlled removal of material fromthe surface of the teeth is known as “etching”.

Typically devices used in the delivery of the carrier fluid stream(e.g., air or inert gas) containing a particulate abrasive haveresembled a sand blaster. More specifically, the generation of anabrasive fluid steam is accomplished by the placement of an abrasive ina reservoir and the drawing of the abrasive from the reservoir, undernegative pressure, into an accelerated air or gas stream. The source ofthe accelerated air or gas stream is typically a pressurized gassupplied from a compressor or tank.

In operation of the foregoing devices, the particle stream is directedthrough a channel of a nozzle (or delivery port) having a precisechannel dimension and geometry. Typically this nozzle is constructed ofmetal or comparable durable material. As is appreciated, the precisedelivery of the particle stream requires that the channel dimensions andgeometry be maintained. Unfortunately, as the abrasive stream passesthrough the channel of the nozzle of the device, the inside diameter ofthe channel is worn (and the original tolerances altered), therebycausing a loss of precision, which ultimately requires the nozzle'sreplacement or replacement of the entire device. Additional maintenanceis also required where, during the course of use, the device is exposedto debris or bacteria and thus must be cleaned prior to re-use. Becauseof the foregoing demands and constraints, such devices are typicallyexpensive and thus are generally not readily discarded, even when inneed of relatively extensive repair or refurbishing. Since such devicesare not generally disposable, individuals must be shied to maintain,clean refill and reassemble them. This presents an opportunity for unitmalfunction from contamination of the abrasive material, and by thereloading of the device with inappropriate and even dangerousparticulate material.

Examples of these prior devices include that described in Fernwood, U.S.Pat. No. 4,941,298, issued on Jul. 17, 1990. Fernwood discloses arear-reservoir micro sandblaster that includes a hollow tubular handlewith a nozzle at one end for dispensing a mixture of a solid materialand a gaseous medium, and a compressed air and solid particulatematerial-receiving member at the other end of the handle. The nozzlesection of the apparatus contains a mixing chamber where a vacuum iscreated by the flowing pressurized gaseous medium, drawing solidmaterial into the chamber from a rear reservoir. Problems with Fernwoodare that it is too costly to be disposable; it draws particulate matterfrom a container using a vacuum rather than by more efficientblow-through (turbulent or vortex) mixing of this gas as per the subjectinvention, and is thus very sensitive to variations in material and gasmoisture levels, and requires an unclogging mechanisms, Fernwood alsooperates at relatively high pressures, 80–100 PSI, requiring a specialtap into the air fines and limiting the range of operational pressures.In addition, The Fernwood device suffers from one or more of thefollowing perceived deficiencies:

-   -   requires special training to set up and use,    -   cannot deliver varying sizes of particles,    -   is contaminated after every use, and    -   is not cost-effective and cannot be completely sterilized        between use.

The apparatus disclosed in the Microetcher™ brochure (available from[insert company and address]) is similar to the Fernwood device in thatit suffers from most, if not all, of the same perceived deficiencies.Other products available from various manufacturers, are similarlylimited, and/or otherwise attempt to differentiate themselves from theircompetition by offering “improvements” relative to case of cleaningand/or sterilization, e.g., Handiblaster™ available fromMirage/Chameleon Dental Products, Inc., of [insert address); andMicroetcher II™ available from [insert supplier, address].

OBJECTS OF INVENTION

It is the object of this invention to remedy the above as well asrelated deficiencies in the prior art.

More specifically, it is the principle object of this invention toprovide a device for delivery of a fluid particle stream that includes acombined particle reservoir and particle mixing chamber integral withsuch device.

It is another object of this invention to provide a device for precisedelivery of a fluid particle stream that is both effective and yetinexpensive and thus readily disposable.

It is still another object of this invention to provide a device forprecise delivery of a fluid particle stream that is pre-charged withparticulate abrasive matter.

It is still yet another object of this invention to provide a device forprecise delivery of a fluid particle strewn which includes an adjustabledispensing conduit, or nozzle, for directing the flow of the fluidparticle stream onto a delimited area of a target surface.

It is an additional object of this invention to provide a device forprecise delivery of a fluid particle stream which includes means forintroduction of the stream of fluid, under pressure, into a mass ofabrasive particles within the device so as to create a turbulent mixturethereof that can be discharged via a dispensing conduit or nozzle onto adelimited area of a target.

It is a yet additional object of his invention to provide a method forprecise delivery of a fluid particle stream to effect selective abrasionof a delimited area of a target.

SUMMARY OF THE INVENTION

The above and related objects are achieved by providing a device for theprecision delivery of a particle stream of abrasive material to adelimited area of a target. In one of the preferred embodiments of theinvention, the device comprises an essentially closed chamber having afitting that is adapted for releasable connection to a source ofpressurized fluid means for directing the pressurized fluid into a massof abrasive particles within the closed chamber so as to generate amixture of fluid and abrasive particles within the closed chamber and anozzle for delivery of the fluid and particle mixture to a delimitedarea of a target. The term “fluid” as used herein is intended asinclusive of gases, liquids and any combination thereof. In thepreferred embodiments of this invention, the source of gas is an aircompressor, or pressurized canister containing & or an inert gas. Theabrasive particles, which are suitable for use in this device, includealuminum oxide, sodium bicarbonate and other common polishing orgrinding agents. The particle size of the abrasive should obviously besmaller than the any of the passages of the device through which theyare to pass. The particle density is to a degree limited by the amountof pressure required to effect mixing thereof with the fluid in thechamber of the device and thereafter the transport/flow of the resultantmixture through the nozzle of the device.

The pressurized fluid is introduced into the chamber at or near the topof the device, and thereafter is directed through a fluid transportconduit to the base of the device where it is forced through afree-flowing mass of particulate (abrasive) matter that has beenpredisposed within the device at the time of its manufacture. Uponinjection of the fluid into the chamber, turbulent mixing of fluid andabrasive particles occurs which mixture is and remains under substantialpressure (generally in excess of one (1) atmosphere). This isaccomplished by control of the cross-sectional area of the fluidtransport conduit relative to the cross-sectional area of the nozzle.The selection of a specific diameter for these two device components isa function of intended use, the particle size of the abrasive materialto be delivery with such device and the desired force to be exerted uponthe target by the fluid particle stream as it is expelled from the endof the nozzle onto the target surface. In the preferred embodiments ofthe invention, the cross-sectional dimension of the fluid transportconduit is greater than the cross-sectional dimension of the nozzle.More specifically, the inside diameter of the conduit designed fordental applications is preferably at least about 50% greater than thecross-sectional area of the nozzle and can range from about 0.01″ toabout 0.20″, with the most preferred diameter being about 0.045″. Theinside diameter of the nozzle can range from about 0.005″ to about0.100″, with the preferred diameter being about 0.021″.

In the preferred embodiment of the invention the nozzle comprises anelongated tube fixedly positioned in an orifice in the base of thechamber, and which extends both into and from the base of the chamber.The degree of extension of the distal end of the nozzle into the chamberis calculated to contribute and promote the formation of a turbulentmixture of fluid and particles in the chamber; and, the proximal end ofthe nozzle, the precise delivery of the fluid stream containing theabrasive particles.

In one of the preferred embodiments of this invention the distal end ofthe nozzle is positioned near the top (lid) of the chamber, and abovethe open end of the fluid transport conduit. In addition, the relativeheight, or extension, of the nozzle into the chamber is also a functionof the volume of abrasive particles that is to be pre-loaded into thechamber at the time of manufacture. More specifically, it is preferablethat the height of the nozzle extend at least above the level of theanticipated abrasive charge, and yet be sufficiently distant from thetop (lid) of the chamber to allow for turbulent mixing and channeling ofthe mixture into the opening at the distal end of the nozzle.

The chamber design of the device is further unique in that it providesan effective and inexpensive configuration for the precise delivery of afluid particle stream in a disposable package.

This invention also provides a method for propelling particulate matteragainst a surface of a target material using the above-describedapparatus, including the steps of delivering a stream of fluid (e.g.gas) into the fluid delivery conduit and from such conduit into thechamber of this device, so that the flow of the gas stream continuouslyblows through the quantity of particulate matter, causing theparticulate matter to mix with the gas stream, forming a gas andparticle mixture, and discharging the mixture through the dischargeconduit and the discharge part to strike the surface of the targetmaterial.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings, which are provided and described herein, are intended tobe illustrative of a number of the preferred embodiments of thisinvention. Where an element of an illustrated device is common to morethan one drawing, it is assigned the same reference numeral forcontinuity of expression and case of understanding.

FIG. 1 is a cross-sectional side view of the preferred embodiment of theinventive particle-propelling apparatus. The particulate matter and gassource are omitted.

FIG. 2 is a partial cross-sectional side view of the apparatus of FIG.1, revealing some of the outer chamber side wall loving optional gridmeasuring markings and a circumferential color-code band.

FIG. 2 a is a perspective view of the apparatus of FIG. 2 in the handsof a user ready for operation.

FIG. 3 is a view as in FIG. 1, showing the apparatus with theparticulate matter added.

FIG. 4 is a view as in FIG. 3, with the apparatus in operationdischarging the gas and particulate matter mixture toward a surface of atarget material.

FIGS. 5 and 6 show alternative embodiments of the claimed apparatus,formed from a conventional industrial syringe.

FIG. 5 a is a perspective view of the apparatus of FIG. 5 in the hand ofa user ready for operation.

FIG. 7 is a perspective view, in partial section, of an alternativeembodiment of the device of this invention in which a fluid deliveryconduit is molded into the body of the device housing.

FIG. 8 is a perspective view of the device of FIG. 7 that has beenmolded from a transparent material.

FIG. 9 is a perspective view of an apparatus including a molded,unidirectional flow control apparatus.

FIG. 10 is a detailed perspective view of the molded, unidirectionalflow control apparatus.

FIG. 10A is a detailed perspective view of the molded, unidirectionalflow control apparatus shown with flow applied.

DETAILED DESCRIPTION OF THE INVENTION INCLUDING PREFERRED EMBODIMENTS

The detailed embodiments of the invention disclosed herein arerepresentative of a number of the preferred configurations of thedevice.

First Preferred Embodiment

Referring to FIGS. 1–4, a disposable particle-propelling apparatus 10 isdisclosed for propelling particulate matter P against target material T.The apparatus 10 includes a cylindrical mixing chamber 16 having achamber wall 20 and two end wall portions 22 (fid) and 24 (base),respectively. Apparatus 10 is powered by a compressed gas source, suchas an air compressor or a compressed gas cylinder (not shown), whichconnects to and is in fluid communication with the gas receiving port 26of end wall portion 22. The gas-delivery conduit 32 extends from the gasreceiving port 26 into the mixing chamber 16. End wall 24 (base) has amixture discharge port 34. A mixture discharge conduit 28 extends influid communication from mixture discharge port 34 into mixing chamber16. A particle directing tube 36 is provided in fluid communication withdischarge port 34 and extends opposite discharge conduit 28 outside frommixing chamber 16- A quantity of particulate matter P is scaled insidechamber 16, the quantity being sufficient to only partially fill chamber16, leaving space for gas and particulate water P to mix. The completesealing of the particulate matter P gives matter P a virtually unlimitedshelf life and protection from contamination (e.g. humidity). Mixingchamber 16 provides a gas-tight seal to maintain particle sterility andto prevent gas leakage during operation. An inlet cap 42 and a lip cap44 seal gas-receiving port 26 and mixture discharge part 34,respectively, and are removed when apparatus 10 is to be connected tothe compressed gas source for use. Volume grid markings 46 arepreferably provided on the wall side portion 20 of chamber 16 so thatthe quantity of particulate matter P used can be measured and visuallyobserved when wall 20 is constructed of a transparent or translucentmaterial. Chamber wall 20 may also be color-coded to identify the typeof particulate matter P. The color code marking CC may indicate theparticle size and the type of particulate matter P. Tube 36 serves toboth direct and accelerate the discharging gas and particular matter Pmixture from the mixing chamber. As a result, the particulate matter Pcan be applied to a focused or delimited area of a target and at auniform velocity. Since apparatus 10 is disposable, tube 36 can befabricated inexpensively to sustain a limited use. Tube 36 is manuallybendable (without crimping) thus permitting it to be quickly set to anangle without crimping, making the discharge omni-directional, and,thus, provide access to-hard-to-reach surfaces. Tube 36 preferably has apreset orifice diameter to accommodate a given size and type ofparticulate matter P, and is preferably made of metal, but may also beformed of suitable durable plastic or comparable material.

Chamber 16 is preferably an integrated chamber with balanceddistribution of weight that is preferably slender enough to hold andmanipulate as though it were a writing instrument. The direct,blow-through, turbulent mixing within chamber 16 makes apparatus 10operational at all orientations relative to the target surface and tothe direction of gravity. The slender construction makes chamber 16 ableto access narrow spaces and operate in small confined areas. Chamber 16can receive and function with varying gas pressures applied togas-receiving port 26, selected to accelerate particles to variousdesired velocities for various given tasks. Turbulent mixing ofparticulate matters P directly in the path of the gas stream withinchamber 16 enables apparatus 10 to deliver particulate matters P of awide range of sizes, and to mix and deliver a wide range of particulatematter types. The direct, blow-through mixing in chamber 16, permitsoperation at very low pressures, thereby increasing the range ofoperational pressures that may be selected.

Apparatus 10 contains no moving parts and is preferably made ofdisposable plastic, so that particulate matter P and apparatus 10 can besterilized at the factory, and apparatus 10 replaced rather thanrefilled and reused. Apparatus 10 is designed to with stand commonsterilization techniques such as autoclave, chemical treatments andirradiation. Contemplated apparatus 10 construction materials mayinclude but are not limited to plastic, stainless steel, Delrin™, andTeflon™. Apparatus 10 is lightweight, manufactured to be recyclable, andeasy to use and replace without training or maintenance.

Apparatus 10 can be constructed from an adapted disposable syringe S ofa type that is extremely common in the health care industry, see FIGS. 5and 6. Needle 36 is attached to a standard syringe needle with a dulledtip, and formed of either metal or plastic. Gas-receiving port 26 is ahole bored into a standard rubber syringe stopper R separated from astandard syringe plunger. Mixture discharge port 34 is the existingdischarge opening of the syringe S, while standard tubing can be usedfor gas delivery conduits 32 and 28.

Second Preferred Embodiment

FIG. 7 depicts an alternative embodiment of the invention wherein thedesign choice of the various component parts thereof is based, in part,upon fabrication demands dictated by injection molding constraints andmanufacturing economies. More specifically, the fluid delivery conduit(32) is fabricated as an integral component of the chamber wall (20).The fluid-deliver conduit (32) is further distinct from the FirstPreferred Embodiment described above in that such conduit now extendsthe full length of the chamber to the base (24) thereof. The base (24)is also unique in that a chute (50) (as more fully illustrated in FIG. 8described hereinafter) has been formed therein to provide for deflectionof the fluid into the chamber so as to cause effective mixing of thefluid and the particle charge into a chute formed within the base of thechamber. This chute includes three distinctive functional features,namely an essentially round or bowl-like cavity (52) that roughlycorresponds in overall dimension with the distal end of thefluid-delivery conduit (32). The second functional features comprises anintermediate section (54), or ascending ramp which is characterized byits progressive slope, that extends for the round or bowl-like cavity(52) to a riser (56) which directs the fluid into the chamber andthereby turbulence and/or a vortex within the chamber so as to effectmixing of the fluid with the free flowing particles that are containedtherein.

FIG. 8 further illustrates additional detail of the construction of thedevice of FIG. 7 wherein the interior of the base of the device isrevealed. More specifically, FIG. 8 depicts a device of the typeillustrated in FIG. 7 fabricated from a plastic material. In this view,the detail of the base (24) is better revealed in that it furtherdepicts the chute (50) and the ascending ramp (54) for channeling thefluid stream from the conduit into the chamber of the device. The chutecan be modified as desired to optimize mixing and/or other operationalobjectives.

Molded Flow Control and Sealing Feature

FIG. 9 includes a feature of the invention wherein the feature providesa means for ensuring unidirectional flow of Gas Stream A and particulatematter (P of FIGS. 3 and 4) as well as providing a means forautomatically sealing the apparatus 10 when the Gas Stream A ceases orthe apparatus 10 is removed from the Airflow source (not shown). Thefeature, a molded, uni-directional flow and sealing apparatus 100, is ofa design conducive to injection molding constraints and manufacturingeconomies. The molded, uni-directional flow and sealing apparatus 100includes at least one slit 110 to allow Airflow (A of FIG. 4) to passthrough as well as sealing the apparatus 10 to entrap the particulatematter P within the mixing chamber 16 while the apparatus is not in use.The function of the molded, uni-directional flow and sealing apparatus100 is described in detail by FIGS. 10 and 10A.

FIGS. 10 and 10A illustrate the function of the molded, unidirectionalflow and sealing apparatus 100. The molded, uni-directional flow andsealing apparatus 100 can be designed to be of a hemispherical shape,whereby the concave side 102 of the unidirectional flow and sealingapparatus 100 would be positioned towards the gas receiving port (26 ofFIGS. 5, 6, 7, 8, and 9) of the apparatus 10 and the convex side 104 ofthe unidirectional flow and sealing apparatus 100 would be positionedtowards the gas mixing chamber (16 of FIGS. 5, 6, 7, 8, and 9). Themolded, unidirectional flow and sealing apparatus 100 comprising aflexible surface that is portioned into flexible sections 112 by the atleast one slit 110. When Gas Stream A is applied to the molded,uni-directional flow and sealing apparatus 100, the Gas Stream A(differential in pressure across the surface) causes flexible sections112 to elastically bend towards the gas mixing chamber (16 of FIGS. 5,6, 7, 8, and 9) creating a passage 116 which allows Gas Stream A to passthrough the molded, unidirectional flow and sealing apparatus 100 andinto the gas mixing chamber 16. When Gas Stream A is removed from themolded, uni-directional flow and sealing apparatus 100, the lack of GasStream A (equilibrium in pressure across the surface) allows theflexible sections 112 to elastically return to the natural state of themolded, uni-directional flow and sealing apparatus 100, returning theflexible sections 112 towards the gas receiving port and closing thepassage 116 (26 of FIGS. 5, 6, 7, 8, and 9); thus entrapping theparticulate matter (P of FIGS. 3 and 4) within the gas mixing chamber16. The molded, unidirectional flow and sealing apparatus 100 can bemolded from a flexible material and stamped to provide the slits 110.The preferred embodiment would be a hemispherical design and include one(1) slit, forming an “I”. The hemispherical design provides ageometrical means to limit the motion of the flexible sections 112during the state lacking Gas Stream A to ensure the flexible sections112 properly seal.

Method

In practicing the invention, the following method may be used. Referenceis once again made to the illustrations of the preferred embodiments,specifically FIG. 4. A stream of gas A is delivered throughgas-receiving port 26 and gas-delivery conduit 32 into chamber 16 fromthe gas air source (not shown). The gas stream A blows through theparticulate matter P and causes the particulate matter P, to mix withthe gas stream in chamber 16. The air and particle mixture M enter andpass through discharge conduit 28, discharge port 34 and directing tube36, and exist the apparatus 10 to strike the target material T, thismethod is performed without generating heat, vibration, appreciablenoise levels, and with a device free of any moving pans. In contrast tothe prior art devices discussed herein which draw the particulate matterfrom a reservoir, under vacuum, into a hand piece (and are thus limitedas to the amount of pressure that can be exerted an the air/particlestream), the direct blow-through of fluid into the particle mass allowsfor modulation of the pressure of the resultant stream over a muchbroader range and thus more precise delivery thereof to a delimited areaof a target.

While the various embodiments of the invention have been described andillustrated herein, such is not intended, nor should it be construed adelimiting the scope of the invention, which is set forth in thefollowing claims.

1. Handheld apparatus for propelling particulate matter, the apparatuscomprising: a mixing chamber having a sidewall, a gas receiving end wallcomprising a gas receiving port at a first end of the mixing chamber anda discharge end wall at an opposite end of the mixing chamber anddesigned to be handheld; a gas delivery conduit, whereby the gasdelivery conduit would be coupled to the gas receiving end wall anddisposed within the mixing chamber and projecting linearly from said gasreceiving end wall into the mixing chamber; a discharge port in thedischarge end wall; a discharge conduit disposed within the mixingchamber and extending in fluid communication from the discharge porttowards the gas receiving port and whereby the gas delivery conduit andthe discharge conduit overlap; an elongated particle-directing tubedisposed external to the mixing chamber, a proximal end of theparticle-directing tube in fluid communication with the discharge port;and the handheld apparatus for propelling particulate matter ispre-charged with a predetermined amount of particulate matter, wherein amaiority of the particulate matter is stored in the mixing chamber, andthe handheid apparatus for propelling particulate matter is notconducive for replacing particulate matter, thus providing an apparatusthat is designed to be disposed of upon the exhaustion of theparticulate matter disposed within the mixing chamber.
 2. The apparatusof claim 1, wherein the size and shape of the mixing chamber resemblesthat of a syringe.
 3. The apparatus of claim 1, wherein the elongatedparticle directing tube is a continuation of the discharge conduit. 4.The apparatus of claim 1, wherein the elongated particle directing tubeis manually bendable making the discharge from the elongated particledirecting tube omni-directional at the time of use.
 5. The apparatus ofclaim 1, wherein the apparatus further comprises a color-coding toidentify the particulate matter.
 6. The apparatus of claim 1, theapparatus further comprising at least one of a gas delivery port cap anda discharge end cap.
 7. The apparatus of claim 6, wherein the apparatusfurther comprising a color-coding to identify the particulate matter. 8.The apparatus of claim 2, the apparatus further comprising an attachmentarea located proximate the gas receiving port to the apparatus, wherebythe attachment area provides a means to couple the apparatus to an airsupply source.
 9. Handheld apparatus for propelling particulate matter,the apparatus comprising: a mixing chamber having a sidewall, a gasreceiving end wall comprising a gas receiving port at a first end of themixing chamber and a discharge end wall at an opposite end of the mixingchamber, a coupling member for coupling the mixing chamber to a gassupply source tube, and designed to be handheld; a gas delivery conduit,whereby the gas delivery conduit would be coupled to the gas receivingend wall and disposed within the mixing chamber and projecting linearlyfrom said gas receiving end wall into the mixing chamber; a dischargeport in the discharge end wall; a discharge conduit disposed within themixing chamber and extending in fluid communication from the dischargeport towards the gas receiving port and whereby the gas delivery conduitand the discharge conduit overlap; an elongated particle-directing tubedisposed external to the mixing chamber, a proximal end of theparticle-directing tube in fluid communication with the discharge port;and the handheld apparatus for propelling particulate matter ispre-charged with a predetermined amount of particulate matter, wherein amajority of the particulate matter is stored in the mixing chamber, andwherein the handheld apparatus for propelling particulate matter is notconducive to the replenishment of particulate matter, thus providing anapparatus that is designed to be disposed of upon the exhaustion of theparticulate matter disposed within the mixing chamber.
 10. The apparatusof claim 9, whereby the gas delivery port is positioned off-center withrespects to the center of the mixing chamber.
 11. The apparatus of claim9, wherein the size and shape of the mixing chamber resembles that of asyringe.
 12. The apparatus of claim 9, wherein the elongated particledirecting tube is a continuation of the discharge conduit.
 13. Theapparatus of claim 9, wherein the elongated particle directing tube ismanually bendable making the discharge from the elongated particledirecting tube omni-directional at the time of use.
 14. The apparatus ofclaim 9, wherein me apparatus further comprises a color-coding toidentify the particulate matter.
 15. The apparatus of claim 9, theapparatus further comprising at least one of a gas delivery port cap anda discharge end cap.
 16. The apparatus of claim 15, wherein theapparatus further comprising a color-coding to identify the particulatematter.
 17. The apparatus of claim 11, the apparatus further comprisingan attachment area located proximate the gas receiving port to theapparatus, whereby the attachment area provides a means to couple theapparatus to an air supply source.
 18. Handheld apparatus for propellingparticulate matter, the apparatus comprising: a mixing chamber having asidewall, a gas receiving port at a first end of the mixing chamber anda discharge end wail at an opposite end of the mixing chamber anddesigned to be handheld; a discharge port in the discharge end wall; adischarge conduit disposed within the mixing chamber and extending influid communication from the discharge port towards the gas receivingport; an elongated particle-directing tube disposed external to themixing chamber, a proximal end of the particle-directing tube in fluidcommunication with the discharge port; a non-removable, self sealingmechanism contiguous to the sidewall of the mixing chamber, wherein theself sealing mechanism opens to allow a gas stream to flow into thehandheld mixing chamber when exposed to a gas stream, and the selfsealing mechanism seals when not exposed to the gas stream, whereby theself sealing mechanism is located between me gas receiving port and memixing chamber; and wherein the self-sealing mechanism is of a flexiblematerial, of a hemispherical geometry, and comprising at least twoslits.
 19. The apparatus of claim 18, wherein the size and shape of themixing chamber resembles that of a syringe.
 20. The apparatus of claim18, wherein the elongated particle directing tube is a continuation ofthe discharge conduit.
 21. The apparatus of claim 18, wherein theelongated particle directing tube is manually bendable making thedischarge from the elongated particle directing tube omni-directional atthe time of use.
 22. Handheid apparatus for propelling particulatematter, the apparatus comprising: a mixing chamber having a sidewall, agas receiving end wall comprising a gas receiving port at a first end ofthe mixing chamber and a discharge end wail at an opposite end of themixing chamber and designed to be handheld; a gas delivery conduit,whereby the gas delivery conduit would be coupled to the gas receivingend wall and disposed within the mixing chamber and projecting linearlyfrom said gas receiving end wall into the mixing chamber; a dischargeport in the discharge end wall; a discharge conduit disposed within themixing chamber and extending in fluid communication from me dischargeport towards the gas receiving port and whereby the gas delivery conduitand the discharge conduit overlap; an elongated particle-directing tubedisposed external to the mixing chamber, a proximal end of theparticle-directing tube in fluid communication with the discharge port;the handheid apparatus for propelling particulate matter is pre-chargedwith a predetermined amount of particulate matter, wherein a majority ofthe particulate matter is stored in the mixing chamber, and wherein thehandheid apparatus for propelling particulate matter is not conducive tothe replenishment of particulate matter, thus providing an apparatusthat is designed to be disposed of upon the exhaustion of theparticulate matter disposed within the mixing chamber, a removablesealing member to temporarily contain the particulate matter within themixing chamber; and wherein: at least one of the gas receiving end walland the discharge end wall abuts and is contiguous with the sidewall ofthe mixing chamber.
 23. The apparatus of claim 22, whereby the gasdelivery port is positioned off-center with respects to the center ofthe mixing chamber.
 24. The apparatus of claim 22, wherein the size andshape of the mixing chamber resembles that of a syringe.
 25. Theapparatus of claim 22, wherein the elongated particle directing tube isa continuation of the discharge conduit.
 26. The apparatus of claim 22,wherein the elongated particle directing tube is manually bendablemaking the discharge from the elongated particle directing tubeomni-directional at the time of use.
 27. The apparatus of claim 22,wherein the apparatus further comprises a color-coding to identify theparticulate matter.
 28. The apparatus of claim 22, wherein the removablesealing member to temporarily contain the particulate matter is of atleast one of a gas delivery port cap and a discharge end cap.
 29. Theapparatus of claim 28, wherein the apparatus further comprising acolor-coding to identify the particulate matter.
 30. The apparatus ofclaim 24, the apparatus further comprising an attachment area locatedproximate the gas receiving port to the apparatus, whereby theattachment area provides a means to couple the apparatus to an airsupply source.
 31. The apparatus of claim 18, the mixing chamber beingpre-charged with a particulate matter providing a disposable apparatusupon the exhaustion of me particulate matter disposed within the mixingchamber.
 32. The apparatus of claim 18, wherein the at least two slitscross.
 33. The apparatus of claim 18, wherein the apparatus furthercomprises a color-coding to identify the particulate matter.